Some time ago, we wrote about how the NFL's "tax-exempt" status doesn't actually mean they aren't required to pay taxes. Surprisingly, the entire world didn't read my article and learn a little about the tax code, because today, the NFL has decided to end its tax-exempt status. You can read Roger Goodell's entire memo to the team owners here.
Essentially, they are removing the tax-exempt status because it doesn't actually change anything for them and they're tired of people not knowing the difference (maybe they should read my article). The only practical change for the NFL is that they will no longer be required to disclose Goodell's salary, so that saves them a PR headache. But in reality, there will be no actual change, because again, the NFL has always had to pay taxes.